VNET [21Vianet] SC 13G: (Original Filing)

[securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. (Continued on the Following Pages) 1. NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Kylin Offshore Master Fund Ltd. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [x] (b) [ ] 3. SEC USE]

VNET [21Vianet] SC 13G: securities, and for any subsequent amendment containing information

[securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. (Continued on the Following Pages) 1. NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Kylin Offshore Master Fund Ltd. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [x] (b) [ ] 3. SEC USE]

VNET [21Vianet] CORRESP: (Original Filing)

[21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District Beijing, 100016 The People’s Republic of China January 3, 2014 VIA EDGAR Stephen Krikorian, Accounting Branch Chief Melissa Walsh, Staff Accountant 100 F Street, N.E. Re: 21Vianet Group, Inc. (the “Company”) Form 20-F for the Fiscal Year Ended December 31, 2012 (the “2012 Form 20-F”) Filed on April 19, 2013]

VNET [21Vianet] CORRESP: 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road

[21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District Beijing, 100016 The People’s Republic of China January 3, 2014 VIA EDGAR Stephen Krikorian, Accounting Branch Chief Melissa Walsh, Staff Accountant 100 F Street, N.E. Re: 21Vianet Group, Inc. (the “Company”) Form 20-F for the Fiscal Year Ended December 31, 2012 (the “2012 Form 20-F”) Filed on April 19, 2013]

VNET [21Vianet] 6-K: 21Vianet Group, Inc. Reports Unaudited Third Quarter 2013

[21Vianet Group, Inc. Reports Unaudited Third Quarter 2013 Financial Results 3Q13 Net Revenues Up 29.8% YOY to RMB514.0 Million 3Q13 Adjusted EBITDA Up 25.5% YOY to RMB95.4 Million Live Conference Call to be Held at 8:00 PM U.S. Eastern Time, November 25, 2013 BEIJING, November 25, 2013 (GLOBE NEWSWIRE) — 21Vianet Group, Inc. (Nasdaq: VNET) (“21Vianet” or the “Company”), the] [FORM 6-K 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District Beijing 100016 The People’s Republic of China (86 10) 8456 2121 x ¨ Form 20-F ¨ ¨ 21Vianet Group, Inc. Shang-Wen Hsiao Chief Financial Officer 6-K 1 d636681d6k.htm FORM 6-K]

VNET [21Vianet] CORRESP: 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road

[21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District Beijing, 100016 The People’s Republic of China November 12, 2013 VIA EDGAR Stephen Krikorian, Accounting Branch Chief Melissa Walsh, Staff Accountant 100 F Street, N.E. Re: 21Vianet Group, Inc. (the “Company”) Form 20-F for the Fiscal Year Ended December 31, 2012 (the “2012 Form 20-F”) Filed on April 19, 2013]

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